[NEW] Add solution for Knight Moves Grid

## 🎯 Problem Information
- **Problem Name**: Knight Moves Grid
- **CSES Link**: https://cses.fi/problemset/task/3217
- **Category**: Introductory Problems
- **Estimated Difficulty**: Easy

## 📋 Problem Description

<img width="672" height="584" alt="Image" src="https://github.com/user-attachments/assets/4eb9d5e4-f191-459c-bc93-eb5f9115981f" />